The Madre Fire became California's largest blaze so far this year, ripping through grasslands after breaking out Wednesday in southeastern San Luis Obispo County. It swiftly grew to more than 82 square miles (212 square kilometers). It was just 10% contained by Thursday evening.

The Madre Fire is the largest wildfire in California in 2025 — surpassing the Los Angeles-area fires that devastated parts of the region in January.

The fire has prompted evacuation orders, warnings, and highway closures in San Luis Obispo County around 100 miles north of Los Angeles.